101 lines
3.5 KiB
Go
101 lines
3.5 KiB
Go
package nameserver
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import (
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"fmt"
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"net"
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"testing"
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"time"
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"github.com/miekg/dns"
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. "github.com/weaveworks/weave/common"
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wt "github.com/weaveworks/weave/testing"
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)
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// Check if the names updates lead to cache invalidations
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func TestServerCacheRefresh(t *testing.T) {
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const (
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containerID = "somecontainer"
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testName1 = "first.weave.local."
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testName2 = "second.weave.local."
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refreshInterval = int(localTTL) / 3
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)
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InitDefaultLogging(testing.Verbose())
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Info.Println("TestServerCacheRefresh starting")
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clk := newMockedClock()
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Debug.Printf("Creating 2 zone databases")
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zoneConfig := ZoneConfig{
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RefreshInterval: refreshInterval,
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Clock: clk,
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}
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dbs := newZoneDbsWithMockedMDns(2, zoneConfig)
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dbs.Start()
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defer dbs.Stop()
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Debug.Printf("Creating a cache")
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cache, err := NewCache(1024, clk)
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wt.AssertNoErr(t, err)
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Debug.Printf("Creating a real DNS server for the first zone database and with the cache")
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srv, err := NewDNSServer(DNSServerConfig{
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Zone: dbs[0].Zone,
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Cache: cache,
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Clock: clk,
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ListenReadTimeout: testSocketTimeout,
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MaxAnswers: 4,
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})
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wt.AssertNoErr(t, err)
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go srv.Start()
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defer srv.Stop()
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time.Sleep(100 * time.Millisecond) // Allow sever goroutine to start
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testPort, err := srv.GetPort()
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wt.AssertNoErr(t, err)
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wt.AssertNotEqualInt(t, testPort, 0, "listen port")
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Debug.Printf("Adding an IPs to %s", testName1)
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dbs[1].Zone.AddRecord(containerID, testName1, net.ParseIP("10.2.2.1"))
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// Zone database #2 at this point:
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// first.weave.local = 10.2.2.1
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// testName1 and testName2 should have no IPs yet
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qName1, _ := assertExchange(t, testName1, dns.TypeA, testPort, 1, 1, 0)
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qName2, _ := assertExchange(t, testName2, dns.TypeA, testPort, 0, 0, dns.RcodeNameError)
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assertInCache(t, cache, qName1, "after asking for first name")
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assertNotLocalInCache(t, cache, qName2, "after asking for second name")
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clk.Forward(refreshInterval / 2)
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Debug.Printf("Adding an IP to %s and to %s", testName1, testName2)
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dbs[1].Zone.AddRecord(containerID, testName1, net.ParseIP("10.2.2.2"))
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dbs[1].Zone.AddRecord(containerID, testName2, net.ParseIP("10.9.9.2"))
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// Zone database #2 at this point:
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// first.weave.local = 10.2.2.1 10.2.2.2
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// second.weave.local = 10.9.9.2
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clk.Forward(refreshInterval/2 + 2)
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// at this point, the testName1 should have been refreshed
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// so it should have two IPs, and the cache entry should have been invalidated
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assertNotInCache(t, cache, qName1, fmt.Sprintf("after asking for %s", testName1))
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assertNotLocalInCache(t, cache, qName2, fmt.Sprintf("after asking for %s", testName2))
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qName1, _ = assertExchange(t, testName1, dns.TypeA, testPort, 2, 2, 0)
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qName2, _ = assertExchange(t, testName2, dns.TypeA, testPort, 0, 0, dns.RcodeNameError)
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assertInCache(t, cache, qName1, fmt.Sprintf("after asking for %s", testName1))
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assertNotLocalInCache(t, cache, qName2, "after asking for a unknown name")
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// delete the IPs, and some time passes by so the cache should be purged...
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dbs[1].Zone.DeleteRecord(containerID, net.ParseIP("10.2.2.1"))
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dbs[1].Zone.DeleteRecord(containerID, net.ParseIP("10.2.2.2"))
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clk.Forward(refreshInterval + 1)
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qName1, _ = assertExchange(t, testName1, dns.TypeA, testPort, 0, 0, dns.RcodeNameError)
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qName2, _ = assertExchange(t, testName2, dns.TypeA, testPort, 0, 0, dns.RcodeNameError)
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assertNotLocalInCache(t, cache, qName1, "after asking for a unknown name")
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assertNotLocalInCache(t, cache, qName2, "after asking for a unknown name")
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}
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